People in South Asia show their affection to their friends in ways that may seem...strange...to the average Westerner. While the American guys I know will give their friends a nod, a hand shake, or at most, the three-pat hug, South Asian guys and gals like to show more affection to their friends of the same gender.
No funny business going on, these men just like to walk arm in arm.
They may not even be best buds, but this guy wanted to drape his arm around his friend.
Men (or women) walking hand in hand is not something you even look twice at.
"Brothers don't shake hands. Brothers hug!"
So the next time you're out walking with your best friend, put your arm around him/her to show just how much you love being buddies. But only if your friend is of the same gender - otherwise, it's just scandalous.